Fexofenadine EP Impurity B CAS 479035-75-1
| CAS No. | 479035-75-1 |
| Molecular Formula | C32H39NO4 |
| Molecular Weight | 501.66 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), Fexofenadine EP Impurity B meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
As a process- or degradation-related impurity, Fexofenadine EP Impurity B (CAS 479035-75-1, C32H39NO4) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Based on its molecular formula C32H39NO4, Fexofenadine EP Impurity B contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 501.66 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
Physical & Chemical Properties
| Molecular Formula | C32H39NO4 |
| Molecular Weight | 501.66 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >90% |
| Storage | Store at room temperature, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 14.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Nitrogen Atoms | 1 |
Related Fexofenadine Standards
- (R)-Fexofenadine (CAS 139965-10-9)
- (S)-Fexofenadine (CAS 139965-11-0)
- Fexofenadine (CAS 83799-24-0)
- Fexofenadine EP Impurity A (CAS 76811-98-8)
- Fexofenadine Impurity 13 (CAS 1010812-98-2)
- Fexofenadine Impurity 28 (CAS CATO-C4X-179428)
- Fexofenadine-D6 (CAS 548783-71-7)
- Fexofenadine Impurity 19 (CAS CATO-C4X-179419)
Recommended Standards
- 2-Methyl-4-(5-methyl-2-(methylthio)thiophen-3-yl)-5-oxo-7-phenyl-N-(pyridin-2-yl)-1,4,5,6,7,8-hexahydroquinoline-3-carboxamide (CAS 476483-20-2)
- Ubenimex Impurity 11 (CAS CATO-C4X-185211)
- 2-(3,6-Bis(hexyloxy)-9H-xanthen-9-yl)benzamide (CAS 1820618-83-4)
- 5-(N-benzyl-N-(6-(4-phenylbutoxy)hexyl)glycyl)-2-hydroxybenzaldehyde (CAS 163923-19-1)
- Piracetam Impurity 6 (CAS 1096803-44-9)
- Selexipag Impurity 7 (CAS CATO-C4X-19617)
- Doxapram impurity 43 (CAS CATO-C4X-197343)
- 2-Methyl-2,7-diazaspiro[3.5]nonane Dihydrochloride (CAS 1610028-42-6)
- Ethyl 4-(benzo[d]oxazol-2-ylamino)benzoate (CAS 20852-34-0)
- 6-Chloro-2-iodo-4-nitro-1-(phenylsulfonyl)-1H-pyrrolo[2,3-b]pyridine (CAS 1227266-95-6)
- 2-(1-((2-(1H-indol-3-yl)ethyl)amino)ethylidene)-1H-indene-1,3(2H)-dione (CAS 337340-62-2)
- 4-Chloro-7-nitrocinnoline (CAS 817209-46-4)
- 4-[(1Z)-3-Oxo-3-phenylprop-1-en-1-yl]phenyl 4-bromobenzene-1-sulfonate (CAS 298215-90-4)
- Allo-D-Ile17-Tirzepatide (CAS CATO-CPTD788962)
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